ORTHOPEDIC DEVICE

Abstract

An orthopedic device with an end effector and a driving device, which is configured to drive the end effector by transferring a torque from the driving device to the end effector, wherein the orthopedic device features an overload protection that is configured to only prevent a transmission of a torque from the end effector to the driving device up to a threshold torque in at least one direction, and the overload protection includes at least a first coupling element and a second coupling element, which can be rotated relative to one another and which are coupled magnetically.

Claims

1. An orthopedic device comprising: an end effector; a driving device which is configured to drive the end effector by transmitting a torque from the driving device to the end effector; an overload protection that is configured to only prevent a transmission of a torque from the end effector to the driving device up to a threshold torque in at least one direction, the overload protection including at least one first coupling element and a second coupling element, which can be rotated relative to one another and which are coupled magnetically.

2. The orthopedic device according to claim 1, wherein the second coupling element includes a plurality of magnets.

3. The orthopedic device according to claim 2, wherein the magnets are detachably arranged in at least one of specially provided indentations and specially provided recesses on the second coupling element.

4. The orthopedic device according to claim 3, wherein the at least one of indentations and recesses are arranged to be equidistant across at least one section of a circumference.

5. The orthopedic device according to claim 2, wherein the device has two first coupling elements, between which the second coupling element is arranged.

6. The orthopedic device according claim 2, wherein at least one of the first coupling elements has a plurality of coupling regions, which are designed in the form of tabs that protrude radially inwards, wherein a quantity of the tabs corresponds to at least one of the number of the magnets and a number of the at least one of indentations and recesses.

7. The orthopedic device according to claim 1, wherein at least one first coupling element or the second coupling element is arranged on a housing and is torque-proof.

8. The orthopedic device according to claim 1, wherein the overload protection has a locking device that is configured to not effect the transfer of the torque from the driving device to the end effector and to prevent the transfer of the torque from the end effector to the driving device up until the point of the threshold torque.

9. The orthopedic device according to claim 8, wherein the locking device includes a jamming roller lock comprising: a housing; at least two clamping discs which are arranged in the housing such that they can be rotated and comprise at least one recess, in which a jamming roller is situated; at least one driving projection; and at least one driven projection; wherein the clamping discs are arranged and designed in such a way that a rotation of the clamping discs is possible by driving the driving projections and a rotation of the clamping discs by driving the driven projections is prevented.

10. The orthopedic device according to claim 9, wherein the recesses of the clamping discs are open radially outwards and are restricted by the housing, wherein the clamping discs comprise a freewheel side, which is large enough to ensure that a clamping roller does not come into contact with the housing, and a locking side, which is small enough to ensure that a jamming roller comes into contact with the housing.

11. An orthopedic device comprising: an end effector; a driving device configured to transmit a torque to drive the end effector; an overload protection configured to prevent a transmission of a torque from the end effector to the driving device up to a threshold torque in at least one direction, the overload protection including at least one first coupling element and a second coupling element, the first and second coupling elements being rotatable relative to each other and being coupled magnetically.

12. The orthopedic device according to claim 11, wherein the second coupling element includes a plurality of magnets.

13. The orthopedic device according to claim 12, wherein the magnets are detachably arranged in at least one of specially provided indentations and specially provided recesses on the second coupling element.

14. The orthopedic device according to claim 13, wherein the indentations and recesses are equidistant across at least one section of a circumference.

15. The orthopedic device according to claim 12, wherein the device has two first coupling elements, the second coupling element being arranged between the first coupling elements.

16. The orthopedic device according claim 12, wherein at least one of the first coupling elements has a plurality of coupling regions, which are designed in the form of tabs that protrude radially inwards, and the tabs correspond to at least one of the number of the magnets and a number of the indentations or recesses.

17. The orthopedic device according to claim 11, wherein the at least one first coupling element or the second coupling element is arranged on a housing and is torque-proof.

18. The orthopedic device according to claim 11, wherein the overload protection has a locking device that is configured to avoid transfer of the torque from the driving device to the end effector and to prevent the transfer of the torque from the end effector to the driving device up to the threshold torque.

19. The orthopedic device according to claim 18, wherein the locking device includes a jamming roller lock comprising: a housing; at least two clamping discs which are arranged in the housing and rotatable, the at least two clamping discs each include at least one recess sized to receive a jamming roller; at least one driving projection; at least one driven projection; wherein the clamping discs are arranged and designed in such a way that a rotation of the clamping discs is possible by driving the driving projections and a rotation of the clamping discs by driving the driven projections is prevented.

20. The orthopedic device according to claim 19, wherein the recesses of the clamping discs are open radially outwards and are restricted by the housing, and the clamping discs include a freewheel side, which is large enough to ensure that a clamping roller does not come into contact with the housing, and a locking side, which is small enough to ensure that a jamming roller comes into contact with the housing.

Description

[0022] In the following, an example of an embodiment of the present invention will be ex-plained in more detail by way of the attached figures: They show:

[0023] FIG. 1a schematic depiction of a part of an orthopedic device according to a first example of an embodiment of the present invention,

[0024] FIG. 2the image from FIG. 1 with the overload protection in an exploded view,

[0025] FIG. 3a part of the overload protection from FIG. 2,

[0026] FIG. 4a sectional view through the components shown in FIG. 3,

[0027] FIG. 5an enlarged section from FIG. 4,

[0028] FIG. 6an axial top view of the components shown in FIG. 3,

[0029] FIG. 7an enlarged section from FIG. 6 and

[0030] FIG. 8an exploded view of a lock.

[0031] FIG. 1 shows a driving device 2, which may be designed, for instance, as an electric motor. It is coupled with an end effector 8 via an overload protection 4 and a gearbox 6, said end effector is only depicted schematically.

[0032] The overload protection 4 has a locking device 10, which is arranged inside the first coupling elements 12, between which a second coupling element 14 is arranged, and which are connected via a return ring 16. The return ring 16, the first coupling elements 12 and the second coupling element 14 are arranged in a housing 30.

[0033] FIG. 2 shows the depiction from FIG. 1 with the driving device 2, the gearbox 6 and the end effector 8, wherein the overload protection 4 is shown in an exploded view.

[0034] The locking device 10 and various rings are visible, said rings being arranged in and next to one another. The first coupling elements 12 are designed as ring-shaped elements that feature a multitude of inward-protruding tabs 18, which act as coupling regions. A second coupling element 14 is situated between the two first coupling elements 12, wherein an inner side 20 of said second coupling element lies flat on the locking device 10 and said second coupling element features a multitude of recesses 22, into each of which a magnet 24 is inserted. The second coupling element 14 is surrounded by the return ring 16 which, when mounted, is connected with the first coupling elements 12 such that it is torque-proof. The first coupling elements 12 and the return ring 16 each feature a small groove 26 by way of which said coupling elements and the return ring can be arranged in a housing such that they are torque-proof.

[0035] FIG. 3 depicts an exploded view of several parts of the overload protection 4. In particular, the groove 26 in the first coupling elements 12 and the return ring 16 are clearly visible. It is also clear to see that the inner side 20 of the second coupling element 14 is wider in the axial direction, i.e. from left to right in FIG. 3, than the part of the second coupling element 14 in which the recesses 22 are situated. This part of the second coupling element 14 also serves as a radial bearing for the two first cou-piing elements 12, the tabs 18 of which lie flat on this part of the second coupling element 14.

[0036] FIG. 4 shows a sectional view through the components shown in FIG. 3. The inner side 20 of the second coupling element 14 is wider than the remaining part of the second coupling element 14. The magnets 24 are surrounded by the respective tabs 18 and the return ring 16. This can be seen more clearly in FIG. 5, which depicts a section from FIG. 4. Clearly visible is one of the magnets 24, which is covered, in FIG. 5, on the right and the left by a tab 18 of one of the two first coupling elements 12. The two first coupling elements 12 are connected to one another radially outwards by the return ring 16. Given that at least the tabs 18, but preferably the com-plete first coupling elements 12 and especially preferably also the return ring 16, are made of a magnetizable material, the lines of force generated by the magnets 24 can be guided in the ring-shaped path 28, which is schematically depicted here.

[0037] FIG. 6 depicts a schematic top view of one of the first coupling elements 12 with the groove 26 and the inward-protruding tabs 18. FIG. 7 shows an enlarged section: here, part of the first coupling element 12 with two tabs 18 and the magnets 24 situated underneath in the second coupling element 14 can be seen. If a torque acting on the end effector 8 is transferred by way of the locking device 10 to the second coupling element 14, a movement of the second coupling element 14 relative to the first coupling element 12 is initially prevented by the forces generated by the magnets 24 and the tabs 18 of the first coupling elements 12. The second coupling element 14 can only be moved relative to the first coupling elements 12 once a thus defined threshold torque is exceeded. To this end, the magnets 24 must be displaced relative to the tabs 18: a torque is required to achieve this. Following a displacement, which corresponds to the distance between two tabs 18, wherein said distance preferably also corresponds to the distance between the recesses in which the magnets 24 are situated, the situationan enlargement of which is depicted in FIG. 7occurs once again and the threshold torque must be overcome again.

[0038] FIG. 8 depicts an exploded view of a jamming roller lock with a driver on the driving side 32 and a driver on the driven side 34. The jamming roller lock features five clamping discs 36, each of which has four recesses 38. Inside said recesses are four jamming rollers 40. The clamping discs 36 with the jamming rollers 40 are situated in a jamming roller housing 42, which restricts the recesses 38 radially outwards. In the example of an embodiment shown, a cover disc 44 prevents the jamming rollers 40 from being able to slip out of the recesses 38 in the axial direction.

[0039] Both the driver on the driving side 32 and the driver on the driven side 34 feature driver claws 46, with which they are or can be engaged with the driving projections or the driven projections.

[0040] In FIG. 8, it is clear that the clamping discs 36 are arranged at an offset to one another, such that an angle between the projections 48 of two adjacent clamping discs 36 in the example of an embodiment shown is 90.

REFERENCE LIST

[0041] 2 driving device [0042] 4 overload protection [0043] 6 gearbox [0044] 8 end effector [0045] 10 locking device [0046] 12 first coupling element [0047] 14 second coupling element [0048] 16 return ring [0049] 18 tabs [0050] 20 inner side [0051] 22 recesses [0052] 24 magnet [0053] 26 groove [0054] 28 ring-shaped path [0055] 30 housing [0056] 32 driver on the driving side [0057] 34 driver on the driven side [0058] 36 clamping disc [0059] 38 recess [0060] 40 jamming roller [0061] 42 jamming roller housing [0062] 44 cover disc [0063] 46 driver claw [0064] 48 projection